@import url('https://fonts.googleapis.com/css?family=Open+Sans:300,700');


:root {
    --max-value: 12;
    --num-shift: 10vh;
    --num-size: 24vh;
    --start-value: 6;
    --color-gray: #B5B5B5;
    --header-height: 8vh;


    --value-progress: calc(var(--value, var(--start-value)) / var(--max-value));
    font-family: Open Sans, sans-serif;
    font-weight: 300;
    font-size: 2.5vh;
}

#app {
    height: 96vh;
    width: 54vh;
    background: linear-gradient(
            to top right,
            hsl(360, 90%, 68%),
            hsl(31, 100%, 51%),
            #EC4E91,
            #9535D3,
            #4DACFF
    );
    background-size: 400% 400%;
    background-position: calc(var(--value-progress) * 100%) 0;
    color: white;
    user-select: none;
    overflow: hidden;
    box-shadow: 0 0 4vh rgba(black, 0.1);

    @media
    (max-width: 740px)
    and (-webkit-min-device-pixel-ratio: 2)
    and (orientation: portrait) {
        width: 100%;
        height: 100%;
    }
}

.ui-header {
    height: var(--header-height);
    width: 100%;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 2vh;
    background: white;
    color: var(--color-gray);

    > * {
        width: 25%;
        flex: 0 0 25%;
    }

    > .ui-text.-app-title {
        text-align: center;
        flex: 1 0 auto;
        white-space: nowrap;
    }

    > .ui-text:last-child {
        text-align: right;
    }
}

.ui-content {
    flex: 1 0 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding-top: var(--header-height);
}

.ui-discounts {
    padding: 2vh 0;
    text-align: center;
    width: calc(100% - 6vh);
    margin: 0 2vh;
    border-bottom: 1px solid rgba(white, 0.25);

    > .ui-text {
        margin: 1vh 0;
        line-height: 1;
        letter-spacing: 0.5px;
    }
}

.ui-value {
    height: var(--num-size);
    width: var(--num-size) * 1.2;
    line-height: var(--num-size);
    margin: 2vh 0;
    font-weight: 700;

    &:before, &:after {
        display: block;
        position: absolute;
        height: 4vh;
        line-height: 4vh;
        top: calc(50% - 2vh);
        font-weight: 300;
        font-size: 2.5vh;
        letter-spacing: 0.5px;
        transition: transform 0.6s ease;
    }
    &:before {
        content: 'Every';
        right: 100%;
        transform: translateX(calc(var(--changing) * -50%));
    }
    &:after {
        content: 'hours';
        left: 100%;
        transform: translateX(calc(var(--changing) * 50%));
    }
}

.ui-digit {
    position: absolute;
    font-size: var(--num-size);
    width: 100%;
    text-align: center;
    height: 100%;
    user-select: none;
}

#num1 {
    transform:
            translateX(calc(var(--progress, 0) * -#{var(--num-shift)}))
            scale(calc(1 + var(--progress, 0)));
    opacity: calc(1 - var(--progress, 0));
    filter: blur(calc(var(--progress) * 2px));
}

#num2 {
    transform:
            translateX(calc(var(--progress, 0) * -#{var(--num-shift)} + #{var(--num-shift)}))
            scale(calc(var(--progress, 0)));
    opacity: var(--progress, 0);
}

.ui-panel {
    width: 100%;
}

.ui-controls {
    background: white;
    padding: 6vh 4vh;
}

.ui-switch {
    margin: 0 auto;
    top: 2vh;
    width: 8vh;
    height: 4vh;
    border-radius: 4vh;
    background-image: linear-gradient(
            to right,
            #FF6850,
            #FF8A2B
    );

    &:before, &:after {
        position: absolute;
        color: #656565;
        margin: 0 2vh;
        height: 2vh;
        top: calc(50% - 1vh);
        display: block;
        font-size: 2vh;
        line-height: 2vh;
        letter-spacing: 0.5px;
    }
    &:before {
        content: 'Off';
        right: 100%;
    }
    &:after {
        content: 'On';
        left: 100%;
    }
}

input#switch {
    position: absolute;
    opacity: 0;
    pointer-events: none;

    &:checked + #app {
        * {
            .ui-switch-track {
                transform: translateX(-2vh) scale(0.8);
            }

            .ui-range-track {
                display: none;
            }
        }
    }

    &:not(:checked) + #app {
        --thumb-opacity: 0;
    }
}

.ui-switch-track {
    position: absolute;
    top: 0;
    left: calc(50% - 2vh);
    width: 4vh;
    height: 4vh;
    border-radius: 50%;
    border: 0.5vh solid rgba(white, 0.1);
    background: white;
    display: block;
    transform: translateX(2vh) scale(0.8);
    transition: transform 0.3s ease;
    box-shadow: 0 0 1vh rgba(black, 0.1);
}

.ui-range {
    width: 100%;
    background: white;
    z-index: 1;

    > input {
        position: absolute;
        z-index: 1;
        top: -3vh;
    }
}

.ui-range-track {
    position: absolute;
    top: 1vh;
    width: calc(100% - 8vh);
    transform:
            translateX(calc(var(--value, #{var(--start-value)}) / 12 * 100% - 50%));
    left: 4vh;
    z-index: 1;
    pointer-events: none;

    &:before, &:after {
        content: '';
        position: absolute;
        width: 8vh;
        height: 8vh;
        border-radius: 50%;
        top: -4vh;
        left: calc(50% - 4vh);
        background: white;
    }

    &:before {
        transform: scale(1.2);
    }

    &:after {
        content: "\f1cb";
        font-family: FontAwesome;
        font-size: 4vh;
        line-height: 8vh;
        color: #FF6850;
        text-align: center;
        top: -4vh;
        box-shadow: 0 0.5vh 2vh 0.5vh rgba(black, 0.1);
    }
}

.ui-range-ticks {
    width: 100%;
    height: 3vh;
    margin-bottom: 6vh;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    padding: 0 2vh;
}

.ui-range-tick {
    width: 4vh;
    transform:
            translateY(calc(var(--proximity) * 1vh - 1vh));

    &:before {
        content: attr(data-value);
        display: block;
        width: 100%;
        text-align: center;
        transform: scale(calc((2 - var(--proximity)) / 3 + 1));
        transform-origin: bottom center;
    }
    &:after {
        content: '';
        position: absolute;
        display: block;
        width: 1px;
        height: 1vh;
        background: white;
        left: calc(50% - 0.5px);
        top: calc(100% + 1vh);
        transform: translateY(calc(var(--proximity) * 0.5vh - 0.5vh));
    }
}

.ui-footer {
    color: var(--color-gray);
    background: white;
    padding: 1rem 0;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    box-shadow: 0 -0.5rem 1rem rgba(gray, 0.1);
    z-index: 1;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: linear-gradient(to bottom right, white, #E7E7EF);
}

html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
}

svg {
    display: none;
}

*, *:before, *:after {
    box-sizing: border-box;
    position: relative;
}



/*// source: https://css-tricks.com/styling-cross-browser-compatible-range-inputs-css/
// thanks, @danieljackstern !!*/
/*


$track-color: #EFEFEF !default;
$thumb-color: white !default;

$thumb-radius: 8vh !default;
$thumb-height: 8vh !default;
$thumb-width: 8vh !default;
$thumb-shadow-size: 4px !default;
$thumb-shadow-blur: 0.5vh !default;
$thumb-shadow-color: rgba(black, 0.1) !default;
$thumb-border-width: 0 !default;
$thumb-border-color: #eceff1 !default;

$track-width: 100% !default;
$track-height: 1px !default;
$track-shadow-size: 0 !default;
$track-shadow-blur: 0 !default;
$track-shadow-color: rgba(0, 0, 0, .2) !default;

$track-radius: 0 !default;
$contrast: 5% !default;

@mixin shadow($shadow-size, $shadow-blur, $shadow-color) {
    box-shadow: $shadow-size $shadow-size $shadow-blur $shadow-color, 0 0 $shadow-size lighten($shadow-color, 5%);
}

@mixin track {
    cursor: pointer;
    height: $track-height;
    transition: all .2s ease;
    width: $track-width;
    opacity: --thumb-opacity;
}

@mixin thumb {
    box-shadow: 0 0.5vh 2vh 0.5vh rgba(black, 0.1);
    background: $thumb-color;
    border: $thumb-border-width solid $thumb-border-color;
    border-radius: $thumb-radius;
    cursor: pointer;
    height: $thumb-height;
    width: $thumb-width;
    opacity: var(--thumb-opacity, 1);
}

[type='range'] {
    -webkit-appearance: none;
    margin: $thumb-height / 2 0;
    width: $track-width;

    &:focus {
        outline: 0;

        &::-webkit-slider-runnable-track {
            background: lighten($track-color, $contrast);
        }

        &::-ms-fill-lower {
            background: $track-color;
        }

        &::-ms-fill-upper {
            background: lighten($track-color, $contrast);
        }
    }

    &::-webkit-slider-runnable-track {
        @include track;
        @include shadow($track-shadow-size, $track-shadow-blur, $track-shadow-color);
        background: $track-color;
    }

    &::-webkit-slider-thumb {
        @include thumb;
        -webkit-appearance: none;
        margin-top: calc(#{$track-height / 2} - #{$thumb-height / 2});
    }

    &::-moz-range-track {
        @include track;
        @include shadow($track-shadow-size, $track-shadow-blur, $track-shadow-color);
        background: $track-color;
    }

    &::-moz-range-thumb {
        @include thumb;
    }

    &::-ms-track {
        @include track;
        background: transparent;
        border-color: transparent;
        border-width: ($thumb-height / 2) 0;
        color: transparent;
    }

    &::-ms-fill-lower {
        @include shadow($track-shadow-size, $track-shadow-blur, $track-shadow-color);
        background: darken($track-color, $contrast);
    }

    &::-ms-fill-upper {
        @include shadow($track-shadow-size, $track-shadow-blur, $track-shadow-color);
        background: $track-color;
    }

    &::-ms-thumb {
        @include thumb;
        margin-top: 0;
    }
}*/
